mysql——jdbc驱动下载&连接mysql例子

mysql-connector-java-5.1.46.zip【解压后里面jar文件就是所需要的】

https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-5.1.46.zip

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jdbc连接例子

有时候还是不行，然后尝试把mysql的驱动复制到Tomcat的lib文件夹里面就可以了

代码

 package com.test;

 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.ResultSet;
 import java.sql.Statement;

 public class Test1 {

     public static void main(String[] args) throws Exception {
         //1、加载驱动
         Class.forName("com.mysql.jdbc.Driver");
         //2、连接mysql的指定数据库
         Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/liwei", "root", "123456");
         //3、通过数据库的连接操作数据库，实现增删改查
         Statement cs = con.createStatement();
         //4、实现sql，然后返回查询结果
         ResultSet rs = cs.executeQuery("select * from user");
         //处理返回结果，
         while(rs.next()) {
             System.out.println(rs.getString(1));
             System.out.println(rs.getString(2));
             System.out.println(rs.getString(3));
         }
         //关闭资源连接
         rs.close();
         cs.close();
         con.close();
     }

 }

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用配置文件来加载

 package com.test;

 import java.io.FileInputStream;
 import java.io.InputStream;
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.Properties;

 public class Test1 {

     public static void main(String[] args) throws Exception {
         Properties pt = new Properties();
         FileInputStream fis = new FileInputStream("dbinfo.properties");
         pt.load(fis);
         String driver = pt.getProperty("driver");
         String uri = pt.getProperty("uri");
         String userName = pt.getProperty("userName");
         String password = pt.getProperty("password");
         //1、加载驱动
         Class.forName(driver);
         //2、连接mysql的指定数据库
         Connection con = DriverManager.getConnection(uri, userName, password);
         //3、通过数据库的连接操作数据库，实现增删改查
         Statement cs = con.createStatement();
         //4、实现sql，然后返回查询结果
         ResultSet rs = cs.executeQuery("select * from user");
         //处理返回结果，
         while(rs.next()) {
             System.out.println(rs.getString(1));
             System.out.println(rs.getString(2));
             System.out.println(rs.getString(3));
         }
         //关闭资源连接
         fis.close();
         rs.close();
         cs.close();
         con.close();
     }

 }

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